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function synthesizeImage() {
return clients.matchAll().then(clients => {
var url = "image-40px.png";
clients.forEach(client => {
client.postMessage(url);
});
return fetch(url);
});
}
self.addEventListener("fetch", function (event) {
if (event.request.url.includes("image-20px.png")) {
event.respondWith(synthesizeImage());
}
});